Eye-forming mechanism.



A. BERG.

EYE FORMING MECHANISM.

APPLICAHON men mm. 7. ms.

Patented Feb. 13, 1917.

4 SHEETS-SHEET 1.

I I y rn.--

BERG. EYE FORMING MECHANiSM.

APPLICATION HLED MAR. L 1916- 1,215,332. Patented Feb. 13, 1917.

4 SHEETS-SHEET 2.

INVENT n 4 SHEETS-SHEET 3.

Patented Feb; 13, 191

A. BERG.

EYE FORMING MECHANISM.

APPLlCAT1ON FILED MAR. 7, 1916.

WHNESSES:

H N w IL r G.

A. BERG.

EYE FORMING MECHANISM.

APPLICATION FILED MAR. 7. $916.

Paten ted. Feb. 13, 1917- 4 SHEETS-SHEET 4,.

{MENTOR I ATTORNE? ANDREW BERG, E BRII DGE PORT, CONNECTICUT, ASSIGNOR TO THE ,GOULTER & MOKENZIE MfLCHINE COMPANY, OF BRIDGEPORT, CONHEGTICUT.

EYE-FORMING Mechanism.

Application filed March 7, 1916. Serial No. 82,582.

To all whom it may concern:

Be it known that 1, ANDREW BERG, citizen of the United States, residing at Bridgeport,

in the county of Fairfield and State of Connecticut, have invented certain new and useful. Improvements in Eye-Forming Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 1

My invention relates to eye forming mechanism, and has for its object to automatically form the eyes in-the ends of hinge butts, flat springs, or for any other purpose where an eye is required in the end of a metal strip.

Referring to the drawings wherein- Figure 1 represents an enlarged upper plan view of a machine adapted for operat-.

ing the necessary tools for forming eyesin the ends of metal strips;

Fig. 2 is a broken enlarged view of the tools, engaged in the first operation ofeye forming;

Fig. 3 isa broken enlarged View of the tools engaged in the second operation of eye forming; I

Fig. 4 represents the completion of an eye and a broken enlarged view of the tools "necessary to complete the same;

Fig. 5 is an enlarged broken upper plan view of the eye forming tools minus the initial bending lever;

Fig. 6 is an enlarged broken upper plan view of the eye forming tools, in the position they will occupy at the finish;

Fig. 7 is broken detail view of the par tially formed eye.

Fig. 8 is a detail upper plan view of the mechanism for clamping the metal strip, and also a view of its actuating cam, and

Fig. 9 is a detail side elevation of the rack clamping block and its actuating toothed segment.

Fig. 10 is a side elevation of the machine, brokenview of the hand wheel, pulleys and legs. Fig. 11 is an enlarged detail side view of the cam for actuating the strip clamping mechanism, broken view of the bar actuated by the cam, and a view of the roll actuated by the bar. Y D

While I show a machine of a particular construction for actuating the eye forming tools, it will be understood that I do not confine myself to any special actuating mechanism for. this purpose, as such can be varied to suit the convenience of the manu facturer. c

v The present machine comprises the bed 1, dl'lVlIlg shaft 2 carrying the pulleys 3, 4. and hand wheel 5 on one end, and thepinion 6 on the opposite end meshing with thelarge gear 7 mounted on the cam shaft 8. On this latter shaft are mounted the cams 9, 10, 11

and 12, for actuating the eye'forming tools presently to be described.

The flat metal strip 13 is advanced into the proper position to be operated upon, and

said strip; is clamped between the stationary block 14 and the shoe 15. The mechanism for actuating said shoe is to be hereinafter more fully described. 5

I6 is arocking lever having the hub portion 17 from which project the journals 18 mounted 1n the standards 19, Fig-.1. This lever is actuatedthrough the medium of the face cam 11 and roll 20. The forward end of thislever carries the tool 21, Fig. 2, to give the mltial bend to the innerend of the metal strip 13; 22 is an arboror former about whose rounded end 22 the initial bend is made.

This arbor or former is mounted on the laterally movable rack bar 23, Fig. 1, and 24 is a pinion meshing with this bar and also with the rack bar 25. actuated through the medium ofthe face cam 9 and roll 26 to eflect the lateral or transverse movement of the bar 23. On the opposite side of the ma chine is similarly actuating mechanism comprising the rack bar 27 carrying on its outer end the roll 28 engaging the face cam 29.

The rack bar 27 meshes with the pinion 3O and the latter with the laterally movable rack bar 31 carrying the pin 32.

33 is a bar adapted to be'actuated at right angles to the rack bars 23 and 31 through the medium ofth'e face cam 12 and roll 34. The bar 33 carries the eye shaping tool 35, having the curved face 36, and also the trimming tool 37 secured to said tool.

The operation of the several tools is as follows: After the metal strip 13 has been advanced the proper distance and clamped in such position, 1n the manner before mentioned, the lever 16 is actuated, Fig; 2, to

give the slight initial bend about the edge of the arbor 22, as shown. This lever is then retreated and the eye forming tool 35 and edge of the arbor or former '22, as shown in Fig. 3. As soon'as the end of the metal strip "is firmly seated on the edge of said arbor, the cutter will cut ,off the end of the metal strip gage the roll 45 on the end of bar 46, Fig. .9,

projecting below the arbor before the eye shaping tool engages.

The result effected by making the trimming tool act both asmeans for forcing the end. of the metal strip against the rounded face of the arbor and also as a cutter is to make the dragging or prolonged cut' 'a for p the purpose presently to be described. The arbor 22 is then retreated, Figs. 5 and 6, and

- strip consists of the bar42, Figs. 1 and 8,

the eye shaping'tool 35 engages the partially formed eye and gradually scrolls the end of the strips-into its curved face 36 assaid tool advances, and when the end of .the strip reaches the correspondingly curved seat 38 of the block 14, Fig.4, it will follow up this curved seat until the end of the. strip is brought firmly against the .undersi'deof the metal strip to form the'eye 39' as shown in Fig. 4. Cutting off the end of the strip at an angle other than a right angle to the curvature of the eye, as shown in Fig. 3, will not only give an increased area or surface to the end a, but will leave the thin'lip b, Fig. 7, so that, when the end a is forcibly brought against. the underside of the strip, Fig. 4, this thin lip b will coincide or merge into the wall of the circular opening 40 of the eye to for 1 an even uninterrupted circle as shown in 4.

The eye 39 is held firmly in the position shown in Fig. 4, while the pin 32, which'pin is a trifle larger-than the opening 40, is forcibly carried through said opening and into the hole 41, located in'theinner face of the arbor 22, as shown in Fig. 6. The pin will not only size thehole 40 but will also force the outer cylindrical surface of the eye firmly against the curved surfaces 36 and 38 to complete the eye, and when thus completed, both the interior and exterior of the eye will form true circles.

The mechanism for clamping the metal carrying the roll 43 at one end to engage the cam 10, and at the opposite end the incline 44 to engage the roll 45 mounted on one end of the. toothed segment lever 46 pivotally supported 'on the pin 47. The shoe 15 is secured to the lowerend of the vertically sliding block 48 by the bolt, 49. The teeth 50, Fig. 9, of this block are engaged by the lever 46 to effect a downward movement of the same and firmly grip the metal strip during the eye forming operation.

The cam 10, Fig. 11, has the cam groove 51 so shaped that the proper stand still and raise it to the position shown in Fig. 11 and hold it in such position until it has reached the point B where it will be released.

The path traveled by the roll from c to d is a true circle and represents the dwell necessary for the bending tools to perform their work.

- Having thus described my invention, what I claim is 1. Mechanism for forming an eye on the end of a metal strip, comprising a support and means for temporarily securing the.

strip thereto, a reciprocating arbor, a reciprocating tool adapted to force the end of the strip against the edge of the arbor to form the initial bend for the proposed eye, a reciprocating eye shaping tool,

havin a concave face, a trimming tool-.lo

'c'ated 1n advance of the eye shaping tool and.

adapted to force the partially formed eye against the arbor and scarf the endof the strip, means for retreating the arbor to per- 'mit the eye shaping tool to engagethe partially formed eye and force the same against the concave seat of. a stationary support,

and a reciprocating sizing pin adapted to be forced through the opening of the eye to finish said openingand also exert an outward pressure against said concave face.

2. Mechanism for forming an; eye onthe end of a metal strip, comprising a support for temporarily securing the strip thereto, a reciprocating arbor having a convex edge, a reciprocating initial bending tool adapted-to "force the strip upon the arbor and against its convex edge to partially form the eye. a

reciprocating eye shaping tool having a concave face, a trimming tool located in advance of the eye shaping tool and moving in unison therewith, said trimming tool adapted to first engage the partially formed eye and force the same against the arbor and scarf the end of the strip, and means for retreat ing said arbor at the completion of the trimming process and while the eye shaping .and

eye shaping tool to scroll up the end of the strip into eye form and force the .same against a support having a concave seat and thus complete the eye.

3. In eye forming tools adapted to form an eyein the end of. a metal strip and. in one operation, a support and means for temporarily securing the strip thereto, a reciprooatiug arbor, a reciprocating tool adapted trimming tools are advanclng to allow the to force the end of the strip against. the arbor to give the initial bend for the proposed eye, combined trimming and eye shaping tools, means for reciprocating the same, the trimming tool located in advance of the eye shaping tool, means for retreating the arbor, and a support having a concave seat, saideye shaping tool adapted to engage the partially formed eye and force it firmly against the concave seat of said suppoi't and 10 complete the eye.

In testimony whereof I affix my signature '"in presence of two witnesses.

. ANDREW BERG.

Witnesses:

- CHRISTI NELSON, MARGARET SMITH. 

